Power hoist



c. RSMITH POWER HOIST July 3, 1945.`

` 3 Sheets-Sheet l v Filed April 13, 1942 Z- Y@ Hm,

yJuly 3, 1945.

130mm H0131' Filed April 13, 1942 3 Sheets-Sheet` 2 July 3 1945- 5 c. R.SMITH 2,379,599.

" POWER HoIsT Filed April 13, 1942 3 Sheets-Sheet 3 Patented July 3,1945` v e v Y noLWERHoIs're ffm lohiilt,smith,nicegaiu,' Y lapplicati-mamaria; ima-serialNaffiaam s claires; (01.212451.)v

"if This'linvention Vrelatesft'o vimprovenients jin power 'hois'ts andmore particularly to ltraversing hoists adapted for builders and roofersusa-al'- 'though capabieof a uvariety' of` other uses. L Thisffinvention may -be considered "a `further developnienty of mytro-pending application for Hoists,

"No-2,305,201 'granted vDecember 15, i942.

v"One objectjjof the invention is'tofprcnvidev a power 'hoist wherein"the" Weight "of the in'otorr `serves to substantially" offset `or'counterbalance the weight of lthe load being'raised thus avoiding anotherwise possible topheavy condition @and contributing materially.v tosafety in operation, the'jmotor being fm'o'unted tothe `boom `to swingwith the load. "'A furtherobje'ct is lto provide a 'power hoist*thattmay `be started or stopped and its speed regulated, lor the brakesYapplierdby"aflsin'gle controleerd, the 'brakes being automatically'applied when the control lever is released.4 l

V .An son further and `very imoortaotjobjectis fto provide 'a powerhoistlwherein the nsectional frame .may bereadily oarriedto 'and erected upon.a jpoint of considerable "elevation by; 'one-man the motorjthereafter`:raised from the 'ground ofi" other 'point 'below the frame 'to theVroof or high'point wholly underitsown power .and fat alltime's`under"comp1et`e rcontrol of the" operator, 'andthere' readily'afiixedkt'o the vframe'in workin'g. position. I The motors usedinfpower hoists are of very considerable weight and vordinarily are`quite vdiiiicult 'to raise to' lpoints 'above fthe groundwithout'the'usel'of derricls ortlie like, butfinthe present instancethis condition Vvis not 'foundas the motor is adapted tofbejraised'endlo-wer'ed readily by its own power.4 y vA` still further objectjisto provide fa power v4hoistfof vg'rea`;i'.'lifting power Vlthat' isof 'few parts, readily lalsseinb'led and, dismantled`, yrugged f and'durable in'v vconstru'ctitm', positive 'emcient in operation, that isvautomatic: 'inlman'y features, 'and that 'calls for but littleattention 'and eiort on the'partofj thel operator.l 't

"with the foregoing and other objects the 'invention consists in thevcombination and ai'ran'gementof jparts*` to be 'hereinafter fullyA de-`scribed, pointed out in itheclaims and illustrated thefaccompanyingdrawingsy which V"forni 'a partpf *this patent, and in which- Eig; jlvis aside'view ofthe powerjhoist wherein the motor visshown 'as 'being'risecl'under its own powerl "from -'a `position fbut recently upon theLv'like' Structure."

, ground-1ro that-ofthe"hermano-p' a. lmii'idnrg.orl

in 4View f Fig. 2 is an venlarged fragmentary -view ofrig. '1

showingthe clutch `lever or control xlever and iuelicontrol' means, thelever and connections being show-n i-n-three positions; e i `Fig. 3 is aside view' of the motor with yits frame, an altered position being'shown 'infdotted lines. f

Fig. 4 is a vertical sectional View through Fig. 3, on the linel#JL-looking in the -direction o'f the arrows. l

Fig. vv5 is a View 'in lperspective fof' the 'braise bands andconnections employed. Y

` 'Arranged at the apex of the triangle is 1the`socke't- Fig. f6 is-adetail vertical sectional view through a `pulley employed.` l n l Fig.7 A*is a viewVinperspective-oi the sectional hoist frame.

'FigBJlis an enlarged detail view Vin sidejelevat'io-'n-= cifan'adjustable boomextension farm the pulley and trip -employed.

Fig '9'1is afront view olf Fig. =8^with` thewtrip omitted, i and Fig. 10v is aside View lco'mple'ate Vhoist plicatien. f

on a reduced scaleof the Like referenceeharacters denote *correspond`ing partsytliroughoutl the several views.v

The power' hoist 'includes a 'sectional yrhein frande`su`bstantiallytriangular in vshape andfcoinf v posed ofhthe 1base 'I rand sides 2; 2Aconnectedby the'bra'ce 3 and "provided with-cross braces A4; 4.

1 '5 provided withabracket `6 to which is 'pivotallv secured the upper`end `of kthe leg Vor .truss bar '1 l.

that rval', its '1o-wer Aend carries a weight' rest' torec'seivea'weight 9k to anchor the frame'. Received in the upper end ofthev socket 5`fis the downturnedend ofthe boom l0 adapted 'to be movedsubstantially horizontally through an arc of 180degrees or 1ess ,"saidboom 'beingco'riiy nec'ted yby a vertical bra'cell and the 'stemfjZ of ahead I3 toa boom brace 'I4 vthat has its'in ner end pivotally receivedlin the socket "l5 arranged upon the said :brace `3, said lhead1? beingfast upon lsaid lboom inwardly fi'omjthe freeend thereof. lThesoclzet Icarries a bracket "i6 con'- nected by a bar H to a collar I8Nadjust'ably farvranged upon said leg `l. Theframe, lleg 'and'boomVmayfloe disconnected lfrom each other when de-I isiredfas when shippingthe "hoist "or when it is noty in use.` By adju-'sting the'leg Arelativelto "the frame the latter may be caused to stand perpen'- Idicu'larprat'an angle to 'the perpendicular.'

The powerunit includes la frame iorrnedof vtwofside members, each oflwhich -cornprisestt'wo Yvertical 4tubularfffrierribers I9 --cormectedbyfa jupon 'a roofs, illustrating its ap" brace 20 intermediate theirends and by front and rear tubes or bars 2|, 22 at their lower ends andby a rear top bar 23. The lower ends of both side members are supportedin angle pieces 24 that extend rearwardly therebeyond as at 25 asclearly shown in Figs. l, 3 and 10. Stub shafts 26 carried by said anglepieces have the wheels 21 loose thereon. Arranged upon the upper ends ofthe said side members are the forwardly extending angle pieces 28 thatkconverge at their forward `extremities and are extended to form thetongue 29 provided at itsforward end with an eye 3D to permit it to bedrawn by a truck sion El, said sides being separated by spacer sleevesBla about the connecting bolts, said trip fork normally resting upon astop 62 upon said extension, said extension being adjustably secured tothe boom I8 and to the brace i4 by bolts 63 passing through the sides ofsaid extension and upon opposite sides of said boom and brace. When inadjusted position the extension is rigid but when the bolts are removedthe extension may Vbe adjusted relative to the boom and brace as may bedesired and'the bolts then ,replaced to lock the extension. Aipulley B4provided with .awheel hanger 85a is mounted at the free end whendesired. Spaced braces 3l connect said ings 32 for the shaft 33 of therope or cable drum 34 that has its central portion of greater diameterthan the ends to which said central portion is tapered, so that thecable wound thereupon Willbe wound uniformly thereover. The drum34carries upon its ends the brake drums 36, 31 provided with the brakebands 38 connected by grips 39 to the control bar 48 the ends .of whichare journaled in bearings arranged -upon said angle pieces 28, one end of said control bar being connected by link 4l and rod 42 to the controllever 43 loose upon said shaft 33.

, Fast to one angle 28 is the cam 44 that is loose about said shaft 33and that is adapted for engagement with the cam lugs 45 of the lever 43,said lever abutting the shaft nut 46. Loose upon shaft 33 is the clutchmember 4l adapted when in engagement with the drum 36 to drive the ropedrum 34 and shaft 33 movable longitudinally in bearings 32.

As shown in Fig. 2 the extreme right hand dotted line position of thelever 43 is its normal position. The clutch is running freely upon shaft33 and the brakes are applied by brakeY band connections, the bandsbeing tight upon `the brake drums. In the full line or intermediateposition of said lever the brakes are oi or free and the clutch runnnigfree. In the left hand dotted line position of said lever the brakes areoff and v said lever through engagement of its Cam lugs 45 with the camface of cam 44 has moved the cable drum with brake drums longitudinallyof shaft 33 into operating engagement withthe clutch 41 which isconnected by sprocket chain 48 with the lsprocket gear of the shaft 49of the motor 50 supported upon the frame bars 2i, 22.' This latterposition of lever 43 is running position and just prior to it assumingthis position the motor throttle 52 is opened Wide, from idlingposition, by means ofthe throttle connection 5| connecting said throttleand lever. Connecting said clutch and brake drum is thev expansion coilspring 53 that yieldingly retains said members in disengaged relation.The speed of the cable drum and consequently of the load is controlledby manipulation of lever 43 by the operator with said lever in runningposition.

l Secured to one vertical side memberl i9 is a bracket 54 to which oneend of a spring 55 is securedgto connect same to abell crankl 56fulcrumed to an angle 28, one arin of said bell crank being reduced andby said spring being yieldingly retained in engagement with a pin 5'!carried at the end of lever 43 to retain the same in running positionwhen desired.

Also engaging saidbell crank' is a. chain 58 connecting same to a tripfork 58 vmounted for pivotal movement to a bolt 6|) connecting .thesides of a substantially L-shapecl boom extenof said yboom extension andprovided with a rope guide 65 mounted to a `floating hub 66 receivedwithin the pulley hub, said guide being adjustable to any desiredposition and then locked by bolt 6l, two positions of said guide beingshown in Figs. 8 and 10. When the hoist ls operated upon a roof orelevation a control cord 68 connected to lever 43 and passing over asheave 68 that is carried by a bracket 'lll depends therefrom. n

The end of the control cord 68 terminates in a loop 1l. Depending fromthe angle 28 is a bracket 8l that carries a sheave 88 over which va cord89 passes to the bell crank l56, the free end of said cord terminatingin a loop 90. Detachably secured to the rear ends of the angles 28 andextending transversely of the motor frame is the inverted U-shaped bail18, the free ends ofthe sides of which are biiurcated and bolted to thestaples 19 of the motor frame. Carried centrally of the base of saidbail is the staple 80 for engagement by the hook 8l carried at one endof the cable 82 that passes between the tines of the trip fork 59 andover the pulley 64 to the cable drum 34. An eye-bolt 83 welded to thebase of the bail 'I8 in line with staple 80 is engaged by chain'84 thatpasses through the staple 85, of tongue 29, also in line with staple 88,said chain being provided terminally with a hook '86.

The lever 43 is retained in normal position by the spring' 13 having oneendsecured to tongue 29 and the opposite end to a bracket 14depending'from the control bar 40. When it is desired to raise the motorby its own power from a position upon the ground or below the roof tothe sectional frame upon a roof 98, or vlike'elevation, the'hook 8| isplaced in the staple 80 and the hook 86 is engaged with the chain 84 atthe proper point to prevent vertical oscillation of the motor, theforked terminations of thesides ofthe bail 1B engaging with the staplesand angles 28 preventing lateral tilting of the motor which mightotherwise occur as the cable 82 is wound back and forth over the cabledrum `as the lifting operation proceeds.

The hook 9| of ground cable 92 is nowplaced in the loop 98 of cord 89.The operator upon the ground now manually moves the control lever 43from normal to running position where it is retained by the bell crank56 and connections and the ascent isstarted. As the cable 82 iswoundupon the drumv the motor is raised from the ground. Aslit movesVupwardly to a point at which it will clear the roof'and firewall theoperator pulls upon the cord 92 from his position upon the ground.rl'his causes cord 89 to disengage the bell crank from the lever 43which moves into normal position, disengagingthe clutch, as the brakes`are automatically set and the vload haltedj The load, with boom l0, isswung hori- Lzontallyto bring the motor over the roof. 'I'he lever 43 isnow manipulated to gentlydeposit the motor upon the roof. 'I'he hook 8|lis now reto operating position and the tongue secured to the head I3,or said members 1, |1 may be again replaced after the frame and motorare in operative position.

In operative position they channel-shaped tongue 29 of the motor framereceives or ts down over and upon the boom It with a thickened orreinforced portion 99 of said tongue resting upon the socket 5 at whichpoint the 2 greatest portion of the weight of the motor is borne, theforward end of said tongue fitting snugly over the head |3, a pin |90being then passed through a perforation in said tongue that registerswith a perforation 93 in said head and the motor and frame are iirmlysecured in operative position. To lower the motor again, when desired,the pin |90 is withdrawn and the motor manually held in place while leg1 and bar I1 and the motor let down upon the wheels 21. 'I'he leg 1 andbar |1 of the sectional frame may be replaced and the motor may again beconnected to its lifting gearing and lowered. The boom extension,previously described, serves among other things to permit moving themotorwith its frame y being normally connected together in full extendedposition by a pin 16a, the lower leg section being provided with aperforation 1Gb tov receive said pin 16a when the sections are partiallytelescoped to shorten the leg. The topmost end of the leg is square tosnugly nt the What is claimed is:

1. In a power hoist, a frame, a motor carried thereby, a cable drumcarried by said frame driven by said motor, a pulley, a cable upon saiddrum passing over said pulley, an inverted U-shaped bail having its endssecured to opposite sides'of said frame, a staple disposed centrally ofthe base of said bail engaged by said cable, an eyebolt disposedcentrally of the base lo of said bail, a second staple carried by said.frame inline with said eyebolt, a chain connecting said eyebolt andpassing through said second staple, and a hook carried by said chain forsechannelled tongue while the lower endis pro- 4 boards ||l| are thenplaced upon the bar 11 and frame bars 2|, 22 and weights placedthereupon to anchor the machine in position.

When the motor is used in position upon the sectional supporting framethe leg 16 is disconnected from the tongue and weights 9, |03, or eitherof them, are placed in position as shown in Figs. 1 and 10. To raise aload 94 by its bail 95 the hook 8| is engaged therewith, the cable 82being wound upon the cable drum. To raise a very heavy load the backgear or tackle 96 is employed, the hook 8| being secured to a staple 91secured to the end of the boom l0. The load is now somewhat more'slowlybut readily raised. From the staple v91 the cable passes about thesheave of the tackle, through the trip 59 and over pulley 64 4to thecable drum. A collar 1| upon cable 82 contacts and raises the trip fork59 when the load 94 is lifted to a certain maxlmum point.

lective engagement with the links thereof.

2. In a power hoist, a frame having a tongue, a motor Kcarried by saidframe, a cable drum carried by said frame and driven by said motor, apulley, a cable upon said drum passing over said pulley, an invertedU-shaped bail having its 0 ends secured to opposite sides of said frame,a

staple disposed centrally of the base of said bail engaged by saidcable, an eyebolt disposed centrally of the base of said bail, a secondstaple carried by said tongue, a chain connecting said eyebolt andpassing through said second staple, said eyebolt and staples beingdisposed in a common plane, and a hook carried by said chain engaging alink thereof.

3. In a power hoist, a frame including a boom, a cable drum, a clutchtherefor, a motor connected thereto, a second frame carrying said cabledrum and motor mounted to said iirst named frame, brakes for said cabledrum, a lever forl said clutch, -means connecting said lever and brakesfor yieldingly retaining said lever in normal position and applying saidbrakes, a bell crank carried by said second frame engaging said lever inrunning position to releasablyv anchor same, a pull cord for said bellcrank, a pulley carried yby said boom,l and a cable upon said drumpassing about Said pulley.

4. In a power hoist, a frame including a boom, a cable drum, a motorconnected thereto, a second frame carrying said cable drum and motor andmounted -to said rst named frame, a pontrol lever for said cable drum,an extension arm adjustably carried by said boom, a trip fork carried bysaid extension arm, a rest for said trip fork carried by said extensionarm, a pulley carried by said extension arm, a cable upon said drumpassing about said pulley, a trip collar carried by said cable, andconnection between 4 said trip fork and control lever.

5. In a power hoist, a frame including a swinging boom, a cable drumassociated therewith, an extension arm adjustably secured to said boom,a pulley carried by said extension arm, a cable guide for said pulley, amotor for said cable drum, a trip fork carried by said extension arm inline with said cable guide, a trip fork rest carried by said extensionarm, a cable upon said drum passing about said pulley through said cableguide and trip fork, connection between said trip fork and motor, and atrip collar carried by said cable.

6. In a power hoist, a swinging boom, a support therefor, a pulleycarriedby said boom, a cable drum, a motor therefor, a frame carrying`said cable drum and motor for detachable application to said boom, and acable upon said drum passing about said pulley for connection to saidframe in one position thereof and for connection to a lload in anotherposition thereof relative to said boom.

CHARLES R. SMTH.

